[RFC PATCH v2 4/4] arm64:numa: adding numa support for arm64 platforms.

Ashok Kumar
2014-12-10T12:26:04Z

On Sat, Dec 06, 2014 at 10:50:57AM -0800, Ganapatrao Kulkarni wrote:
> On Sat, Dec 6, 2014 at 1:36 AM, Ashok Kumar <ashoks@broadcom.com> wrote:
> > On Sat, Nov 22, 2014 at 02:53:30AM +0530, Ganapatrao Kulkarni wrote:
> >> Adding numa support for arm64 based platforms.
> >> creating numa mapping by parsing the dt node numa-map.
> >>
> >> Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@caviumnetworks.com>
> > Ganapat,
> >
> > Can we get a simple version of this patchset with just the associativity parameter for the cpu and memory nodes
> > upstream? The initial patchset can be with the assumption of a simple full mesh topology for the distance. The
> > hierarchical complex topologies and the DT nodes and properties for that can be added in a later patch, once the
> > standard for that is agreed upon.
> > We are planning to support ACPI based NUMA for Broadcom Vulcan processors(http://www.broadcom.com/press/release.php?id=s797235).
> > I am working on a patch to add support for the SRAT and SLIT ACPI tables based on your patch and I will post that
> > patchset soon, so it will be helpful if the core changes are upstream.
> >
> to implement, ibm/ppc like implementation, we need efi-stub patch to
> not remove the memory node from the dt.
> current efi-stub parses dt file and removes memory nodes.
> can i get the efi-stub patch to start with please?

Ganapat,
I tried the below patch in qemu and it works. Would this be of help to you?

Roy/Ard,
Is the below patch fine?

>From 27b4aecf09707e3d5bd4ff7bf765cd609772476f Mon Sep 17 00:00:00 2001
From: Ashok Kumar <ashoks@broadcom.com>
Date: Tue, 9 Dec 2014 17:23:11 +0530
Subject: [PATCH] efi/arm64: Remove deleting memory nodes in efi-stub

Dont delete memory nodes from DT as it will be
used by NUMA configuration.

Signed-off-by: Ashok Kumar <ashoks@broadcom.com>
---
arch/arm64/kernel/setup.c | 12 +++++++++++-
drivers/firmware/efi/libstub/fdt.c | 24 +-----------------------
2 files changed, 12 insertions(+), 24 deletions(-)

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 27f65b0..ac6d34f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -302,7 +302,7 @@ static void __init setup_processor(void)

static void __init setup_machine_fdt(phys_addr_t dt_phys)
{
- if (!dt_phys || !early_init_dt_scan(phys_to_virt(dt_phys))) {
+ if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys))) {
early_print("\n"
"Error: invalid device tree blob at physical address 0x%p (virtual address 0x%p)\n"
"The dtb must be 8-byte aligned and passed in the first 512MB of memory\n"
@@ -313,6 +313,16 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
cpu_relax();
}

+ /* Retrieve various information from the /chosen node */
+ of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
+
+ /* Initialize {size,address}-cells info */
+ of_scan_flat_dt(early_init_dt_scan_root, NULL);
+
+ /* Setup memory, calling early_init_dt_add_memory_arch */
+ if (!IS_ENABLED(CONFIG_EFI))
+ of_scan_flat_dt(early_init_dt_scan_memory, NULL);
+
machine_name = of_flat_dt_get_machine_name();
}

diff --git a/drivers/firmware/efi/libstub/fdt.c b/drivers/firmware/efi/libstub/fdt.c
index c846a96..a02e56e 100644
--- a/drivers/firmware/efi/libstub/fdt.c
+++ b/drivers/firmware/efi/libstub/fdt.c
@@ -22,7 +22,7 @@ efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
unsigned long map_size, unsigned long desc_size,
u32 desc_ver)
{
- int node, prev, num_rsv;
+ int node, num_rsv;
int status;
u32 fdt_val32;
u64 fdt_val64;
@@ -52,28 +52,6 @@ efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
goto fdt_set_fail;

/*
- * Delete any memory nodes present. We must delete nodes which
- * early_init_dt_scan_memory may try to use.
- */
- prev = 0;
- for (;;) {
- const char *type;
- int len;
-
- node = fdt_next_node(fdt, prev, NULL);
- if (node < 0)
- break;
-
- type = fdt_getprop(fdt, node, "device_type", &len);
- if (type && strncmp(type, "memory", len) == 0) {
- fdt_del_node(fdt, node);
- continue;
- }
-
- prev = node;
- }
-
- /*
* Delete all memory reserve map entries. When booting via UEFI,
* kernel will use the UEFI memory map to find reserved regions.
*/
--
1.9.1

Thanks,
Ashok